The greatest unknown

Personality No. 2 is what modern depth psychology calls the unconscious – something in which we are all psychically contained and in which we all live, but which we really do not know; it is truly unconscious. It is so unknown to us that we cannot even say my unconscious; for we do not know where it begins or where it leaves off. Our dreams come from this realm. Contrary to various other schools of psychology, Jung never let himself be pushed into “explaining” this unconscious by way of a theory or a religious teaching; for him it always remained literally that which is unknown to us, of an immeasurable depth and breadth.

- Marie Louise von Franz, Dreams, p. 24